CN209477374U

CN209477374U - It is a kind of can rounded corner centre drill

Info

Publication number: CN209477374U
Application number: CN201821963155.5U
Authority: CN
Inventors: 吕加宣; 王怀峰; 林健; 管明炎; 刘宝成
Original assignee: Hangzhou Aerospace Electronic Technology Co Ltd
Current assignee: Hangzhou Aerospace Electronic Technology Co Ltd
Priority date: 2018-11-27
Filing date: 2018-11-27
Publication date: 2019-10-11
Anticipated expiration: 2028-11-27

Abstract

The utility model relates to it is a kind of can rounded corner centre drill, including knife bar, the knife bar includes cutting edge and chip space, the cutting edge and chip space rounding off, and chip space is in inverted cone-shaped setting；The chip space includes the first chip space and the second chip space; and first chip space and the second chip space be arranged about the axisymmetrical of knife bar; the cutting edge includes two groups; the axis two sides of knife bar are arranged in cutting edge described in two groups, and cutting edge described in every group includes main cutting edge, end cutting edge, rounded corner cutting edge and protection cutting edge；The advantages of the utility model: by the way that cutting edge is arranged to main cutting edge, end cutting edge, rounded corner cutting edge, part first passes through main cutting edge elder generation drilling processing when processing, shape centre bore, end cutting edge assisted machining, aperture fillet is shaped by rounded corner cutting edge again, centre bore and rounded corner can process at one time, and do not have to tool changing, improve processing efficiency.

Description

It is a kind of can rounded corner centre drill

Technical field

The utility model relates to it is a kind of can rounded corner centre drill.

Background technique

Centre drill is used for the prefabricated accurate positioning of hole machined, and guidance fluted drill carries out hole machined, reduces error.In order to remove On part aperture burr and be convenient for component assembly, generally require in aperture rounded corner.Processing the general step with rounding corner apertures is, Centre drill centering is first used, then processes hole with drill bit, finally uses forming cutter rounded corner, point three steps are completed, and efficiency is lower, and are added The forming cutter intensity of the small rounded corner of work is very low, easily tipping.Due to that can generate chip in process, various drill bits are respectively provided with row Consider slot to be worth doing, generic central brill is limited to structure, and chip space is mostly helicla flute, and space is limited, and chip removal is difficult, and drill bit is easily squeezed by chip It is disconnected.It, should be cold using coolant liquid in process in order to reduce friction, reduction bit wear, timely heat dissipation and more preferable scrap fallaway But liquid enters cutting edge from chip space, and since generic central is bored, chip discharge groove is limited, and coolant liquid is not easily accessible, and causes to cool down It is not enough, in batch machining, drill bit is prone to wear, and reduces service life.Generic central drill bar is cylinder, numerical control Lathe row adopts and is screwed in knife position, thus generic central bore can not clamping in row knife position, an end face processing knife can only be occupied Position is bored using generic central and needs to fill a rounded corner forming cutter more, and numerically-controlled machine tool knife position is limited, and numerous parts need much knives Processing, can only shut down tool changing, influence processing efficiency when knife position is inadequate.

Utility model content

The technical problems to be solved in the utility model be just to provide it is a kind of can rounded corner centre drill, solve existing centre drill The technical issues of not being capable of processing rounded corner and leading to part overall processing low efficiency.

In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions: one kind can rounded corner Centre drill, including knife bar, the knife bar includes cutting edge and chip space, the cutting edge and chip space rounding off, and is arranged Slot is considered to be worth doing to be arranged in inverted cone-shaped；The chip space includes the first chip space and the second chip space, and the first chip space and second row The axisymmetrical that slot is considered to be worth doing about knife bar is arranged, and the cutting edge includes two groups, and the axis of knife bar is arranged in cutting edge described in two groups Two sides, cutting edge described in every group include main cutting edge, end cutting edge, rounded corner cutting edge and protection cutting edge.

Preferably, the knife bar further includes one section convenient for flat body of the knife bar clamping on numerically-controlled machine tool, and the width of flat body Less than the diameter of flat body.

Preferably, central angle alpha corresponding to the chip space be 6~10 °, and the thickest ε of back taper be equal to 0.55~ 0.65mm。

Preferably, distance ζ of the chip space end face away from point of a knife is 5~6mm.

Preferably, the tool cutting edge angle κ of the cutting edge_rIt is 45 °, the auxiliary angle κ of the cutting edge_r' it is 90.6~91 °.

Preferably, the main cutting edge, end cutting edge, rounded corner cutting edge, protect the cutting edge inclination of cutting edge be 25~ 35 °, the angle β between the rounded corner cutting edge and horizontal direction is 3~5 °.

In conclusion the advantages of the utility model: 1. by being arranged to main cutting edge, end cutting edge, rounding for cutting edge Angle cutting edge, part first pass through the drilling of main cutting edge elder generation and process when processing, forming centre bore, end cutting edge assisted machining, then by Rounded corner cutting edge shapes aperture fillet, and centre bore and rounded corner can process at one time, and does not have to tool changing, improves processing effect Rate, by cutting edge and chip space rounding off, and chip space is arranged to the first chip space and the in inverted cone-shaped setting chip space Two chip spaces can be such that coolant liquid when processing is entered by chip space, and the chip of generation is discharged by chip space, due to cooling abundant, batch When amount processing, drill bit is not easy to wear, and chip space is in inverted cone-shaped, can be reduced the friction with hole wall, prevents broken drill, if plus Work is too deep, can prevent diameter contact part end face by protecting cutting edge machined part end face and damage；

2. being able to achieve knife bar in the clamping of numerically-controlled machine tool row's knife position screw, without occupying an end by the setting of flat body Face processes knife position, to save a knife position, it is ensured that there is enough dress knife positions can ensure that without shutting down tool changing for row knife position Processing efficiency；

3. by the corresponding central angle alpha of chip space be 6~10 °, and the thickest ε of back taper be equal to 0.55~ 0.65mm, when processing, can be reduced the friction with hole wall, prevent broken drill, improve security performance when processing, improve drill bit Service life；

4. setting 5~6mm away from the distance ζ of point of a knife for chip space end face, it can ensure that the abundance of chip space, prevent drill bit It is squeezed off by chip；

5. by the tool cutting edge angle κ of cutting edge_rIt is set as the auxiliary angle κ of 45 ° and cutting edge_r' 90.6~91 ° are set as, processing When can be further reduced friction with hole wall, prevent broken drill；

6. be 3~5 ° by angle β between rounded corner cutting edge and horizontal direction, when processing, is avoided that part end face It destroys, improves the quality of part processing, the cutting edge inclination for protecting cutting edge is arranged to 25~35 °, start to cut when processing too deep Work is cut, can prevent from directly contacting part end face and damaging.

Detailed description of the invention

Fig. 1 be the utility model one kind can rounded corner centre drill structural schematic diagram；

Fig. 2 is the top view of Fig. 1.

Appended drawing reference:

1 knife bar, 2 cutting edges, 21 main cutting edges, 22 end cutting edges, 23 rounded corner cutting edges, 24 protection cutting edges, 3 chip removals Slot, 31 first chip spaces, 32 second chip spaces, 4 flat bodies.

Specific embodiment

As shown in Figure 1 and Figure 2, it is a kind of can rounded corner centre drill, including knife bar 1, the knife bar 1 includes cutting edge 2 and row Consider slot 3, the cutting edge 2 and 3 rounding off of chip space to be worth doing, and chip space 3 is arranged in inverted cone-shaped；The chip space 3 includes the One chip space 31 and the second chip space 32, and the first chip space 31 and the second chip space 32 are arranged about the axisymmetrical of knife bar 1, The cutting edge 2 includes two groups, and the axis two sides of knife bar 1 are arranged in cutting edge 2 described in two groups, and cutting edge 2 described in every group wraps Main cutting edge 21, end cutting edge 22, rounded corner cutting edge 23 and protection cutting edge 24 are included, when processing, first central station clamping exists On machine tool chuck, to knife, make the utility model axle center and hole axle center to be processed to just, by the way that cutting edge is arranged to main cutting Sword, end cutting edge, rounded corner cutting edge, part first pass through main cutting edge elder generation drilling processing when processing, shape centre bore, pair cutting Sword assisted machining, then aperture fillet is shaped by rounded corner cutting edge, centre bore and rounded corner can process at one time, without changing Knife improves processing efficiency, and by cutting edge and chip space rounding off, and chip space is arranged in inverted cone-shaped setting chip space First chip space and the second chip space can be such that coolant liquid when processing is entered by chip space, and the chip of generation is discharged by chip space, by Sufficiently in cooling, when batch machining, drill bit is not easy to wear, and chip space is in inverted cone-shaped, can be reduced the friction with hole wall, prevents from boring Head fractures, if processing is too deep, can prevent diameter contact part end face by protecting cutting edge machined part end face and damage It is bad.

The knife bar 1 further includes one section convenient for flat body 4 of 1 clamping of knife bar on numerically-controlled machine tool, and the width of flat body 4 is less than The diameter of flat body 4 is able to achieve knife bar 1 in the clamping of numerically-controlled machine tool row's knife position screw, without occupying one by the setting of flat body 4 A end face processes knife position, to save a knife position, it is ensured that row knife position has enough dress knife positions, without shutting down tool changing, energy Ensure processing efficiency.

Central angle alpha corresponding to the chip space 3 is 6~10 °, and the thickest ε of back taper is equal to 0.55~0.65mm, It can be reduced the friction with hole wall when processing, prevent broken drill, improve security performance when processing, that improves drill bit uses the longevity Life, the distance ζ of 3 end face of chip space away from point of a knife are 5~6mm, can ensure that the abundance of chip space, prevent drill bit from being squeezed by chip It is disconnected, the tool cutting edge angle κ of the cutting edge 2_rIt is 45 °, the auxiliary angle κ of the cutting edge 2_r' it is 90.6~91 °, it can be further when processing The friction with hole wall is reduced, broken drill is prevented, the main cutting edge 21, end cutting edge 22, rounded corner cutting edge 23, protection are cut The cutting edge inclination for cutting sword 24 is 25~35 °, and the angle β between the rounded corner cutting edge 23 and horizontal direction is 3~5 °, is passed through Angle β between rounded corner cutting edge 23 and horizontal direction is 3~5 °, and when processing is avoided that the destruction of part end face, improves zero The quality of part processing will protect the cutting edge inclination of cutting edge 24 to be arranged to 25~35 °, start cutwork, energy when processing too deep Prevent from directly contacting part end face and damaging, the active length ι of the cutting edge is 1~2mm, the diameter δ of cutting edge with it is to be added The difference in work aperture is 0.02mm.

In addition to above preferred embodiment, for the utility model there are also other embodiments, those skilled in the art can root It is made various changes and modifications according to the utility model, without departing from the spirit of the utility model, should belong to the utility model Range defined in appended claims.

Claims

1. one kind can rounded corner centre drill, including knife bar, it is characterised in that: the knife bar includes cutting edge and chip space, institute Cutting edge and chip space rounding off are stated, and chip space is arranged in inverted cone-shaped；

The chip space includes the first chip space and the second chip space, and the axis of the first chip space and the second chip space about knife bar Line is symmetrical arranged, and the cutting edge includes two groups, and the axis two sides of knife bar are arranged in cutting edge described in two groups, is cut described in every group Sword includes main cutting edge, end cutting edge, rounded corner cutting edge and protection cutting edge.

2. one kind according to claim 1 can rounded corner centre drill, it is characterised in that: the knife bar further include one section just In flat body of the knife bar clamping on numerically-controlled machine tool, and the width of flat body is less than the diameter of flat body.

3. one kind according to claim 1 can rounded corner centre drill, it is characterised in that: in corresponding to the chip space Heart angle α is 6~10 °, and the thickest ε of back taper is equal to 0.55~0.65mm.

4. one kind according to claim 3 can rounded corner centre drill, it is characterised in that: the chip space end face is away from point of a knife Distance ζ be 5~6mm.

5. one kind according to claim 1 can rounded corner centre drill, it is characterised in that: the tool cutting edge angle κ of the cutting edge_r It is 45 °, the auxiliary angle κ of the cutting edge_r' it is 90.6~91 °.

6. one kind according to claim 1 can rounded corner centre drill, it is characterised in that: the main cutting edge, secondary cutting Sword, rounded corner cutting edge, protect cutting edge cutting edge inclination be 25~35 °, between the rounded corner cutting edge and horizontal direction Angle β be 3~5 °.